In this article, the design paradigm involving molecular weight, alkyl substituents, and donor-acceptor interaction for poly[2,6-(4,4-bis-alkyl-4H-cyclopenta[2,1-b;3,4-b']-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (cyclopentadithiophene-benzothiadiazole) copolymer (CDT-BTZ) toward field-effect transistors (FETs) with ultrahigh mobilities is presented discussed. It shown that weight plays a key role in improving hole mobilities, reaching an exceptionally high value of up to 3.3 cm(2)...

Field-effect transistors with highly ordered active layers are fabricated by zone-casting discotic dodecyl-substituted hexa-peri-hexabenzocoronene molecules onto hydrophobic substrates to form semiconducting columnar structures (see Figure). The discs columns that possess long-range order on the scale of square centimeters, and devices show order-of-magnitude improvements in charge-carrier mobilities over previously reported devices.

Abstract Solution-processed organic photovoltaic cells (OPVs) hold great promise to enable roll-to-roll printing of environmentally friendly, mechanically flexible and cost-effective devices. Nevertheless, many high-performing systems show best power conversion efficiencies (PCEs) with a thin active layer (thickness is ~100 nm) that difficult translate processing high reproducibility. Here we report new molecular donor, benzodithiophene terthiophene rhodanine (BTR), which exhibits good...

We present a solution processed organic field-effect transistor based on benzothiadiazole (BTZ)−cyclopentadithiophene (CDT) copolymer with mobilities as high 0.17 cm2/Vs and an on/off ratio of 105. This pronounced performance together the lack macroscopic order in thin film makes this conjugated attractive candidate for low-cost electronics due to its facile processing.

The influence of molecular packing on the performance polymer organic field-effect transistors is illustrated in this work. Both close π-stacking distance and long-range order are important for achieving high mobilities. By aligning polymers from solution, induced, yielding hole mobilities up to µsat = 1.4 cm2 V−1 s−1 current on/off ratios Ion/Ioff 105. Detailed facts importance specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or...

Organic semiconducting materials offer the advantage of solution processability into flexible films. In most cases, their drawback is based on low charge carrier mobility, which directly related to packing molecules both local (amorphous versus crystalline) and macroscopic (grain boundaries) length scales. Liquid crystalline ordering offers possibility circumventing this problem. An advanced concept comprises: i) application with different liquid phases, ii) orientation a viscosity high...

Three hexa-peri-hexabenzocoronenes (HBCs) with branched, bulky alkyl substituents of different lengths in the periphery aromatic core have been synthesized to tune self-association properties solution. 1H NMR and photophysical measurements were used probe solution organization comparison known hexa-dodecyl-substituted HBC solvent systems. Thermodynamic parameters for solution, obtained by curve fitting concentration- temperature-dependent data using van't Hoff analysis, indicated that is an...

Abstract Polycyclic aromatic hydrocarbons (PAHs) have attracted enormous interest due to their unique electronic and optoelectronic properties as well the potential applications in organic electronics. This article reviews progress modern synthesis of large PAHs with different sizes, shapes, edge structures, substituents. Due outstanding self-organization characteristics, discotic liquid-crystalline properties, self-assembled nanostructures on surfaces, application devices will be discussed.

Ultrahigh-mobility organic field-effect transistors (OFETs) based on a CDT-BTZ donor-acceptor copolymer are realized by reaching high molecular order and pronounced alignment in single fibers within short OFET channel via solution processing. The macromolecules directionally self-assemble quasi crystal-like the providing this way an unhindered charge carrier pathway with mobilities as 5.5 cm2 V−1 s−1.

Dopant-free HTM KR321 showed highly ordered characteristic face-on organization leading to increased vertical charge transport and PCE over 19% in PSC with improved stability.

The structural organization of three different families semicrystalline π‐conjugated polymers is reported (poly(3‐hexylthiophene) (P3HT), poly[2,6‐(4,4‐bis‐alkyl‐4H‐cyclopenta‐[2,1‐b;3,4‐b0]‐dithiophene)‐ alt ‐4,7‐(2,1,3‐benzothiadiazole)](cyclopentadithiophene‐benzothiadiazole) (CDT‐BTZ) and poly(N,N"‐bis‐2‐octyldodecylnaphtalene‐1,4,5,8‐bis‐dicarboximide‐2,6‐diyl‐ ‐5,5–2,2‐bithiophene (P(NDI2OD‐T2))). These have triggered significant interest for their remarkable charge‐transport...

Utilizing dynamic self-assembly and self-sorting to obtain large-area, molecularly precise monolayered structures represents a promising approach toward two-dimensional supramolecular organic frameworks (2D SOF) or 2D polymers. So far, related approaches suffer from small domain sizes, fragility weak long-range internal order. Here we report on the of host–guest enhanced donor–acceptor interaction, consisting tris(methoxynaphthyl)-substituted truxene spacer, naphthalene diimide substituted...

Uniaxially aligned, thin films of a discotic columnar thermotropic liquid crystalline material can be prepared by simple solution zone-casting method, without the need for modified surfaces or traditional alignment techniques. Atomic force microscopy together with X-ray diffraction reveals single-crystalline-like order over several square centimeters, far exceeding requirements application such in organic molecular electronic devices as field-effect transistors.

The facile synthesis of a new five-ring-fused pentacene analog with four symmetrically fused thiophene ring units (Dithieno[2,3-d;2′,3′-d′]benzo[1,2-b;4,5-b′]dithiophene, Cn-DTBDT) is presented. After aligning this material from solution, thin films for organic field-effect transistors were obtained, resulting in excellent hole mobilities up to 1.7 cm2V−1s−1, and on/off ratio 107. Detailed facts importance specialist readers are published as "Supporting Information". Such documents...

Graphene-type molecules, typically large polycyclic aromatic hydrocarbons (PAHs), have gained enormous interest because of their unique self-organization behavior and promising electronic properties for applications in organic electronics. This article reviews the thermotropic supramolecular organization discotic PAHs bulk as well self-assembly on surface at different length scales. Applications field-effect transistors solar cells are discussed light various processing approaches from...

Four new DTS−BTD copolymers (P1−P4) differing by the concentration of electron-donating and -withdrawing substituents along backbone have been synthesized characterized 2D-WAXS in bottom-contact FETs. While all can self-assemble into lamellar superstructures, only P2 P4 show a propensity to π-stack. exhibits hole mobility as high 0.02 cm2 V−1 s−1 excellent agreement with close π-stacking distances found structural analysis (0.36 1.84 nm, respectively) absorbs homogenously across entire...

The influence of the core extension perylene tetracarboxdiimides on thermotropic behavior has been investigated. A homologous series alkyl substituted tetracarboxdiimides, namely, diimide, terrylene quaterrylene and coronene was synthesized. These compounds display absorption maxima in region 430−760 nm with high extinction coefficients show a thermal stability up to 450 °C. Structural evaluation revealed an identical columnar self-organization for derivatives below their isotropization...

The control of the intracolumnar organization disc-shaped polycyclic aromatic hydrocarbons has essential influence on material's properties including thermotropic behavior and charge carrier transport which are crucial for applications in organic electronics. utilization a broad toolbox peripheral substitution allows well-defined modification molecular interactions packing within helical columnar stacks (see figure).

A new n-type organic semiconductor, i.e., C12-4CldiPBI, is synthesized by a simple and facile route. Single crystal ribbons of C12-4CldiPBI are grown facilely solvent vapor diffusion strategy. Organic field-effect transistors based on individual fabricated technique named "Au stripe mask" method. All devices exhibit excellent transistor behavior with negligible hysteresis, all give an electron mobility over 1.0 cm2 V−1 s−1 the highest 4.65 s−1. Moreover, air stability.

Extensive efforts have been made to develop novel conjugated polymers that give improved performance in organic photovoltaic devices. The use of based on alternating electron-donating and electron-accepting units not only allows the frontier molecular orbitals be tuned maximize open-circuit voltage devices but also controls optical band gap increase number photons absorbed thus modifies other critical device parameter-the short circuit current. In fact, varying nonchromophoric components a...

Abstract The photovoltaic parameters, i.e., the short‐circuit current, open‐circuit voltage and device fill factor, of bulk heterojunction solar cells that use perylene diimide (PDI) derivatives as electron acceptors are often far below theoretically expected values for reasons still not entirely understood. This article demonstrates characteristics blend films regioregular poly(3‐hexylthiophene) (rr‐P3HT) PDI molecules improved upon using a core‐alkylated derivative instead used N‐alkylated...